Top 10 Reefs in Indonesia
Indonesia sits at the apex of the Coral Triangle, the marine area with the highest coral and reef fish species diversity on earth. The country's 17,000-island archipelago spans a vast range of ocean conditions — from the warm, shallow Banda Sea to the cold upwellings of Komodo — and harbours reef systems that range from current-swept pinnacles with oceanic predators to sheltered macro-photography bays with bizarre invertebrate life. No single country offers as much variety in reef diving. All sites are on the interactive map.
1. Raja Ampat, West Papua
Raja Ampat encompasses the islands around Pulau Wayag and extends across the Bird's Head Seascape, a protected area that contains the highest recorded marine biodiversity of any reef system globally. A single dive at Cape Kri in 2001 produced a world record of 374 fish species identified in one dive. The soft coral diversity is comparable to Fiji; the hard coral diversity exceeds anywhere else on earth. Wobbegong sharks Orectolobus sp., walking sharks Hemiscyllium sp., and Papuan reef mantas Mobula sp. are endemic attractions. Best season: October to April.
2. Komodo National Park, Nusa Tenggara
Komodo's reefs benefit from cold Indian Ocean upwellings that produce enormous fish biomass. Crystal Rock and Castle Rock are submerged pinnacles exposed to strong currents that concentrate schooling fish — bumphead parrotfish Bolbometopon muricatum, dogtooth tuna Gymnosarda unicolor, grey reef sharks Carcharhinus amblyrhynchos — while Manta Alley on the southern coast of Komodo Island is a channel where resident oceanic mantas Mobula birostris can number twenty or more individuals simultaneously. Best season: April to November for mantas.
3. Wakatobi National Park, Southeast Sulawesi
Wakatobi is a remote national park in the southeast of Sulawesi whose name is an acronym of the four main islands: Wangi-wangi, Kaledupa, Tomia, and Binongko. The reef system has exceptional hard coral diversity with minimal bleaching damage attributable to the relatively cool, well-mixed waters of the Banda Sea approach. The house reef at the single upmarket resort on Tomia Island is documented as one of the best house reefs in the world. Rare invertebrates include nudibranchs of extraordinary variety and the blue-ringed octopus Hapalochlaena sp. Best season: April to November.
4. Bunaken National Park, North Sulawesi
Bunaken, near Manado, is one of Indonesia's oldest marine protected areas and was protected before most of the country's conservation infrastructure existed. The walls of Bunaken Island drop from three metres at the surface to over forty metres in a single vertical face, colonised by enormous sea fans Gorgonia sp. and barrel sponges Xestospongia testudinaria. Napoleon wrasse Cheilinus undulatus are regular. The park's long protection has produced fish biomass significantly above regional averages. Best season: May to October.
5. Lembeh Strait, North Sulawesi
The Lembeh Strait, a narrow channel between the mainland and Lembeh Island near Bitung, is the world's most celebrated destination for muck diving — diving on black volcanic sand and rubble seabeds to find bizarre, camouflaged, and unusual invertebrate and fish life. Mimic octopus Thaumoctopus mimicus, frogfish Antennarius sp. in multiple colour forms, flamboyant cuttlefish Metasepia pfefferi, hairy frogfish, and mandarin dragonet Synchiropus splendidus on twilight dives are signature finds. Coral reef diving is secondary here to the macro benthic community. Best season: July to November.
6. Banda Sea, Maluku
The Banda Sea is the deep oceanic basin south of the Maluku Islands, reached by liveaboard from Ambon or Sorong. Its seamounts — particularly around Banda Neira and the volcanic Gunung Api — are nutrient-enriched and host some of the most spectacular wall and blue-water diving in Southeast Asia. Schooling hammerheads Sphyrna lewini, manta rays, and large pelagic fish are the draws. The historical association with the Dutch spice trade adds land-based interest to what is an outstanding dive destination. Best season: October to March.
7. Misool, Raja Ampat
Misool is the southernmost large island of Raja Ampat and is protected by a no-take zone enforced by the Misool Foundation, which operates a resort within the area. Fish biomass in the no-take zone is measurably higher than surrounding areas; the recovery in shark and grouper populations since protection was established in 2005 is one of the best-documented case studies in small-scale MPA effectiveness. The underwater topography includes extraordinary mushroom islands and cave systems. Best season: October to April.
8. Triton Bay, West Papua
Triton Bay is a remote fjord-like bay south of the Bird's Head peninsula, best known for aggregations of whale sharks Rhincodon typus that gather around bagan fishing platforms — traditional floating fish platforms — to feed on bycatch thrown back into the water. The encounters are surface-accessible and year-round but more common from October to April. The adjacent reef systems have good hard coral cover and notable diversity of benthic invertebrates. Best season: October to April.
9. Bali, Crystal Bay and Nusa Penida
Crystal Bay on Nusa Penida south of Bali is the primary site for encounters with ocean sunfish Mola mola, which visit shallow cleaning stations between July and October when cold water upwellings from the Indian Ocean bring their preferred cool temperatures. Individual mola mola approaching three metres in height are seen. Outside the mola season, the bay has good hard coral and large fish populations. Strong currents make it unsuitable for beginners. Best season: July to October for mola.
10. Alor, Nusa Tenggara
Alor is a remote island at the eastern end of Nusa Tenggara, two hours by propeller plane from Bali, and one of Indonesia's least-visited serious dive destinations. The currents between Alor and the adjacent small islands generate spectacular fish life: schooling hammerheads, Napoleon wrasse, large grouper, and an unusual diversity of pygmy seahorses Hippocampus bargibanti and H. denise on sea fans. Liveaboard or small locally-run resort access. Best season: May to November.